better cross compile compatibility

config/env.ini

@@ -103,7 +103,7 @@ AR=${SPC_DEFAULT_AR}
 RANLIB=${SPC_DEFAULT_RANLIB}
 LD=${SPC_DEFAULT_LD}
 ; default compiler flags, used in CMake toolchain file, openssl and pkg-config build
-SPC_DEFAULT_CFLAGS="-fPIC -O3 -pipe -fno-plt -fno-semantic-interposition -fstack-clash-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffunction-sections -fdata-sections"
+SPC_DEFAULT_CFLAGS="-fPIC -O3 -pipe -fno-plt -fno-semantic-interposition -fstack-clash-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffunction-sections -fdata-sections -Wno-unused-command-line-argument"
 SPC_DEFAULT_CXXFLAGS="${SPC_DEFAULT_CFLAGS}"
 SPC_DEFAULT_LDFLAGS="-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -Wl,-z,noexecstack -Wl,--gc-sections"
 ; upx executable path

src/Package/Target/php.php

@@ -270,12 +270,14 @@ class php extends TargetPackage
             }
         }
         // linux does not support loading shared libraries when target is pure static
-        $embed_type = getenv('SPC_CMD_VAR_PHP_EMBED_TYPE') ?: 'static';
-        if (SystemTarget::getTargetOS() === 'Linux' && ApplicationContext::get(ToolchainInterface::class)->isStatic() && $embed_type === 'shared') {
-            throw new WrongUsageException(
-                'Linux does not support loading shared libraries when linking libc statically. ' .
-                'Change SPC_CMD_VAR_PHP_EMBED_TYPE to static.'
-            );
+        if ($package->getName() === 'php-embed') {
+            $embed_type = getenv('SPC_CMD_VAR_PHP_EMBED_TYPE') ?: 'static';
+            if (SystemTarget::getTargetOS() === 'Linux' && ApplicationContext::get(ToolchainInterface::class)->isStatic() && $embed_type === 'shared') {
+                throw new WrongUsageException(
+                    'Linux does not support loading shared libraries when linking libc statically. ' .
+                    'Change SPC_CMD_VAR_PHP_EMBED_TYPE to static.'
+                );
+            }
         }
     }
 

src/Package/Target/php/unix.php

@@ -128,6 +128,10 @@ trait unix
         $args[] = $installer->isPackageResolved('php-cgi') ? '--enable-cgi' : '--disable-cgi';
         $embed_type = getenv('SPC_CMD_VAR_PHP_EMBED_TYPE') ?: 'static';
         $args[] = $installer->isPackageResolved('php-embed') ? "--enable-embed={$embed_type}" : '--disable-embed';
+        // Cross-compile: pass --host so configure picks the correct fiber asm file and host_cpu logic
+        if ($host_triple = SystemTarget::getAutoconfHostTriple()) {
+            $args[] = "--host={$host_triple}";
+        }
         $args[] = getenv('SPC_EXTRA_PHP_VARS') ?: null;
         $args = implode(' ', array_filter($args));
 

src/StaticPHP/Package/PackageBuilder.php

@@ -15,6 +15,7 @@ use StaticPHP\Util\FileSystem;
 use StaticPHP\Util\GlobalPathTrait;
 use StaticPHP\Util\InteractiveTerm;
 use StaticPHP\Util\System\LinuxUtil;
+use StaticPHP\Util\System\UnixUtil;
 
 class PackageBuilder
 {
@@ -178,14 +179,15 @@ class PackageBuilder
         if (SystemTarget::getTargetOS() === 'Darwin') {
             shell()->exec("dsymutil -f {$binary_path} -o {$debug_file}");
         } elseif (SystemTarget::getTargetOS() === 'Linux') {
+            $objcopy = LinuxUtil::findCommand('llvm-objcopy') ?: 'objcopy';
             if ($eu_strip = LinuxUtil::findCommand('eu-strip')) {
                 shell()
                     ->exec("{$eu_strip} -f {$debug_file} {$binary_path}")
-                    ->exec("objcopy --add-gnu-debuglink={$debug_file} {$binary_path}");
+                    ->exec("{$objcopy} --add-gnu-debuglink={$debug_file} {$binary_path}");
             } else {
                 shell()
-                    ->exec("objcopy --only-keep-debug {$binary_path} {$debug_file}")
-                    ->exec("objcopy --add-gnu-debuglink={$debug_file} {$binary_path}");
+                    ->exec("{$objcopy} --only-keep-debug {$binary_path} {$debug_file}")
+                    ->exec("{$objcopy} --add-gnu-debuglink={$debug_file} {$binary_path}");
             }
         } else {
             logger()->debug('extractDebugInfo is only supported on Linux and macOS');
@@ -199,9 +201,10 @@ class PackageBuilder
      */
     public function stripBinary(string $binary_path): void
     {
+        $strip = UnixUtil::findCommand('llvm-strip') ?: 'strip';
         shell()->exec(match (SystemTarget::getTargetOS()) {
-            'Darwin' => "strip -S {$binary_path}",
-            'Linux' => "strip --strip-unneeded {$binary_path}",
+            'Darwin' => "{$strip} -S {$binary_path}",
+            'Linux' => "{$strip} --strip-unneeded {$binary_path}",
             'Windows' => 'echo "Skip strip on Windows"', // Windows strip is not available for now
             default => throw new SPCInternalException('stripBinary is only supported on Linux and macOS'),
         });

src/StaticPHP/Runtime/Executor/UnixAutoconfExecutor.php

@@ -11,6 +11,7 @@ use StaticPHP\Package\LibraryPackage;
 use StaticPHP\Package\PackageBuilder;
 use StaticPHP\Package\PackageInstaller;
 use StaticPHP\Runtime\Shell\UnixShell;
+use StaticPHP\Runtime\SystemTarget;
 use StaticPHP\Util\InteractiveTerm;
 use ZM\Logger\ConsoleColor;
 
@@ -149,13 +150,17 @@ class UnixAutoconfExecutor extends Executor
      */
     private function getDefaultConfigureArgs(): array
     {
-        return [
+        $args = [
             '--disable-shared',
             '--enable-static',
             "--prefix={$this->package->getBuildRootPath()}",
             '--with-pic',
             '--enable-pic',
         ];
+        if ($host_triple = SystemTarget::getAutoconfHostTriple()) {
+            $args[] = "--host={$host_triple}";
+        }
+        return $args;
     }
 
     /**

src/StaticPHP/Runtime/SystemTarget.php

@@ -127,4 +127,35 @@ class SystemTarget
     {
         return in_array(self::getTargetOS(), ['Linux', 'Darwin', 'BSD']);
     }
+
+    /**
+     * Returns a GNU host triple for autoconf --host= when SPC_TARGET names an
+     * architecture different from the build host (true cross-compile).
+     * Returns null for same-arch builds.
+     * Strips libc version suffix (-gnu.2.17 → -gnu) and trailing flags (e.g. ' -dynamic').
+     */
+    public static function getAutoconfHostTriple(): ?string
+    {
+        $target = (string) getenv('SPC_TARGET');
+        if ($target === '' || str_contains($target, 'native')) {
+            return null;
+        }
+        $cleaned = preg_split('/\s+/', trim((string) preg_replace('/(-gnu|-musl)\.[\d.]+/', '$1', $target)))[0];
+        if ($cleaned === '') {
+            return null;
+        }
+        // Only emit --host for true cross-arch builds; same-arch (incl. cross-libc) lets autoconf detect.
+        $target_arch_token = explode('-', $cleaned)[0];
+        $arch_aliases = [
+            'x86_64' => ['x86_64', 'amd64'],
+            'aarch64' => ['aarch64', 'arm64'],
+            'arm' => ['arm', 'armv6', 'armv7', 'armhf', 'armel'],
+            'i386' => ['i386', 'i486', 'i586', 'i686'],
+        ];
+        $host_arch = GNU_ARCH;
+        if (array_any($arch_aliases, fn ($aliases) => in_array($target_arch_token, $aliases, true) && in_array($host_arch, $aliases, true))) {
+            return null;
+        }
+        return $cleaned;
+    }
 }